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Home > Archive > Unix Programming > July 2005 > Linear address allocation
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Linear address allocation
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| Amrith 2005-07-29, 8:08 am |
| Hi all,
How the Kernel decides the allocation of the Linear address space for
process.
1. Is it based on the BASE field in the SEGMENT DESCRIPTOR. In that
case, How it is assume this linear address for the Base field.
2. Is the value in the BASE address is assumed from the machine where
the kernel is compiled.
Please clarify my doubts..
Thanks & Regards
Amrith
yahoo id: amrithac
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| Maxim Yegorushkin 2005-07-29, 8:08 am |
| Amrith wrote:
> Hi all,
>
>
> How the Kernel decides the allocation of the Linear address space for
> process.
>
>
> 1. Is it based on the BASE field in the SEGMENT DESCRIPTOR. In that
> case, How it is assume this linear address for the Base field.
<quite from Understanding the Linux kernel>
The 2.4 version of Linux uses segmentation only when required by the 80
x 86 architecture. In particular, all processes use the same logical
addresses, so the total number of segments to be defined is quite
limited, and it is possible to store all Segment Descriptors in the
Global Descriptor Table (GDT).
</quote>
> 2. Is the value in the BASE address is assumed from the machine where
> the kernel is compiled.
The value of the BASE for User and Kernel code and data segment
descriptors is always 0.
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